54 



LABORATORY OUTLINE OF NEUROLOGY 



sheep's brain if the human specimen is not well preserved or not 

 cut in the exact median plane), paying particular attention to 

 the extent and boundaries of the ventricles. Trace the ven- 

 tricular boundaries from the interventricular foramen (of Monro) 

 back to the central canal of the spinal cord. Note especially 



habenula 

 plexus cKH 



stria medthal. 

 fissura ansata 

 (cruciafa) 



tn 



col.forn. 



corpus pineale 

 commissura posterior* \ 

 colliculus superior. \ \ 



lamina quadrigemina 

 culmen monticulu 

 sulcus pnmarius, 

 declive monticuli 



pyramis 



fissura secunda. 

 uvula 



can.cen 



plexus chffi / ^S<^____. .JX^ZS ~\''" \\\ x nc.cal. 



ventriculus/' x ^\""I \ vel.med.ant N^com.ant 



partus x / N c.trap. \ \x lamina term, 



rec. cfcT P0 " 5 Vecpreop. 



Fig. 10. — Median section of the brain of the sheep. Slightly reduced. 

 The exposed ventricular surfaces are stippled. Aq.S., aqueductus cerebri 

 (Sylvii); area olf.med., area olfactoria medialis or nucleus olfactorius 

 medialis; b.ol., bulbus olfactorius; can.cen., central canal of spinal cord; 

 eh., chiasma optica; c.mam., corpus mamillare; col.forn., columna fornicis; 

 com.ant., commissura anterior; com.hab., commissura habenularum; 

 c.lrap., corpus trapezoideum; f.M., foramen interventriculare (Monroi); 

 g.i., gyrus intermedius; g.marg.ant., gyrus marginahs anterior; g.marg. 

 post., gyrus marginalis posterior; hyp., hypophysis; inf., infundibulum; 

 lamina term., lamina terminalis; med.obl., medulla oblongata; m.i., massa 

 intermedia; ped.cer., pedunculus cerebri; plexus ch.III, plexus chorioideus 

 ventriculi tertii; plexus ch.IV. plexus chorioideus ventriculi quarti; r.c.cal., 

 rostrum corporis callosi; rec.cb., recessus cerebelli; rec.preop., recessus 

 preopticus; s.pol., sulcus parolfactorius; stria med.thal., stria medullaris 

 thalami; t.ol., tuberculum olfactorium (intermediate olfactory nucleus); 

 vel.med.anl., velum medullare anterius; v. Ill, ventriculus tertius.- 



the thin parts of the ventricular walls: lamina terminalis, 

 choroid plexus of the third ventricle, anterior medullary velum, 

 and membranous roof of the fourth ventricle (tegmen fossa 

 rhomboidese), the last two forming the roof of the ventricle 

 above and below the cerebellum respectively. 



